Improved receive.go

- Fixed configuration listen-port semantics
- Improved receive.go code for updating listen port
- Updated under load detection, how follows the kernel space implementation
- Fixed trie bug accidentally introduced in last commit
- Added interface name to log (format still subject to change)
- Can now configure the logging level using the LOG_LEVEL variable
- Begin porting netsh.sh tests
- A number of smaller changes

src/trie.go

@@ -38,7 +38,7 @@ type Trie struct {
  */
 func commonBits(ip1 []byte, ip2 []byte) uint {
 	var i uint
-	size := uint(len(ip1)) / 4
+	size := uint(len(ip1))
 
 	for i = 0; i < size; i++ {
 		v := ip1[i] ^ ip2[i]